* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Helvetica Neue", Helvetica, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, sans-serif;
}

.page-container {
  padding: 20px;
}

.page-header {
  margin-bottom: 20px;
}

.operation-container {
  margin-bottom: 20px;
}

.table-container {
  margin-top: 15px;
}

.chart-container {
  height: 400px;
  width: 100%;
} 